This is earned for finding optional collectible #4. If missed on the first run, you can "Play Episodes" and select specific parts of the Episode in order to find the missing optional photos through collectibles mode
. The following collectible is described and can be seen in the video below at 3:22:
Once you go inside the church, look on the table to the left, and take a pin.
Getting all 6 collectibles in this episode will also reward you with the following: